An integrated Authentication, Authorization and Roles solution for your Rails 3 app with support for multiple ORMs

If you like the straight forward and effective nature of Strong Parameters and suspect that CanCan might be overkill for your project then you'll love Petergate's easy to use and read action and content based authorizations.

Aegis is an authorization solution for Ruby on Rails that supports roles and a RESTish, resource-style declaration of permission rules.

Easy role authorization in rails

Role based authorization with CanCanCan for Active Admin

Simple, light and functional authorization library

Pundit authorization support for graphql

Support authentication via OAuth2 tokens dispensed from the Doorkeeper authorization flow

Simple role-based authorization for Rails applications with multi-tenancy support

The swiss army knife of instagram functionality. Restores all deprecated hashtag functionality from the instagram api without any of the authorization.

Simple object-based role authorization in Rails

This gem provides a daemon that handles authorization and reporting of web services managed by 3scale.

Authorization for Rails with Web Interface

Moat is an small authorization library built for Ruby (primarily Rails) web applications

Rails authorization plugin

Agnostic authorization component for Trailblazer.

Authorization framework

Signup or login using Paypal's Authorization or Permissions api's

Contextually is a gem for running Rails controller tests under different user contexts in a convenient way. So you can test your authorization without much effort.

AuthorizedPersona is a rails implementation of Betterment's Persona Centric Authorization pattern